Record Display for the EPA National Library Catalog

RECORD NUMBER: 45 OF 3601

OLS Field Name OLS Field Data
Main Title Acid-fast bacteria and yeasts as indicators of disinfection efficiency /
Author Engelbrecht, Richard S. ; Haas, Charles N. ; Shular, Jeffrey A. ; Dunn, David L. ; Roy, Dipak
Other Authors
Author Title of a Work
Engelbrecht, Richard S.
CORP Author Illinois Univ. at Urbana-Champaign. Dept. of Civil Engineering.;Municipal Environmental Research Lab., Cincinnati, OH.
Publisher Municipal Environmental Research Laboratory, Office of Research and Development U.S. Environmental Protection Agency,
Year Published 1979
Report Number EPA-600/2-79-091
Stock Number PB80-124795
OCLC Number 06535316
Subjects Yeast. ; Ozonization. ; Chlorination. ; Drinking water.
Additional Subjects Bacteria ; Yeasts ; Disinfection ; Potable water ; Indicator species ; Efficiency ; Microorganism control(Water) ; Chlorination ; Ozonization ; Water treatment ; Coliform bacteria ; Evaluation ; Bioindicators ; Drinking water ; Candida parapsilosis ; Mycobacterium fortuitum
Internet Access
Description Access URL
http://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=9100PJAS.PDF
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
EHAM  TD747.A34 Region 1 Library/Boston,MA 04/29/2016
EJAD  EPA 600/2-79-091 Region 3 Library/Philadelphia, PA 06/16/2000
EJBD ARCHIVE EPA 600-2-79-091 Headquarters Library/Washington,DC 01/22/2014
EJBD  EPA 600-2-79-091 Headquarters Library/Washington,DC 09/15/2014
EKAM  TD747.A34 Region 4 Library/Atlanta,GA 11/06/1998
EKBD  EPA-600/2-79-091 Research Triangle Park Library/RTP, NC 09/07/2001
ESAD  EPA 600-2-79-091 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB80-124795 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 01/01/1988
Collation xii, 143 pages : illustrations ; 28 cm.
Abstract
Since the coliform group of organisms is considered to be less resistant to chlorine than some bacterial and viral pathogens, the utility of both yeast and acid-fast oganisms as potntial indicators of disinfection efficiency was evaluated. In most laboratory studies these two groups of organisms were represented by Candida parapsilosis and Mycobacterium fortuitum, respectively. The relative resistance of the rest organisms to free chlorine was: acid fast greater than yeast greater than coliforms. The increased chlorine resistance of these organisms appeared to be the result of the thickness and impermeability of the cell wall. It was concluded that the primary mode of action of chlorine in disinfection was disruption of the cell membrane with a resultant change in cell permeability and physical damage to the cell DNA. Resistance to ozonation was also studied. Variations in pH between 5 and 10 did not significantly affect organism survival of either yearor acid-fast organisms using constant ozone residuals, while increasing temperatures increased the inactivation of both organisms. Large volume sampling and enumeration techniques were developed for the yeasts and acid-fast organisms using membrane filtration which enabled the enumeration of these organisms at the relatively low densities found in finished drinking water.
Notes
EPA-600/2-79-091. Includes bibliographical references.